SELECTED APPLICATIONS of CAVITATION BASED ADVANCED OXIDATION PROCESSES (AOPs) for TREATMENT of WATER and INDUSTRIAL EFFUENTS

Cavitation phenomenon was effectively applied for enhancement of Advanced Oxidation Processes (AOPs) effectiveness. Main applications are focused on treatment of water as well as industrial effluents [1-2]. Cavitation phenomenon can be generated in the liquid by intentionally formed differences in local pressure. It can be obtained by local increase of the liquid flowrate (hydrodynamic cavitation) or by ultrasounds (sonocavitation/acoustic cavitation). The paper presents selected achievements in the field of cavitation based AOPs with presentation of most important results of applicational studies on these group of processes. During the presentation recent developments of our research group will be presented in respect to effective degradation of several pollutants present in industrial effluents, including volatile organic compounds (VOCs) and BTEXs. Special attention will be made on possibility of application of cavitation phenomenon for activation of persulfates using direct as well as catalytic route. Details on optimization of process parameters will be discussed and related to mechanisms responsible for transformation or organic pollutants during cavitational treatment [3-7]. Developed technologies will be discussed in terms of specific instrumentation used to perform the process, details of process control, economical evaluation, scale-up aspects, hybrid – cavitation-catalytic processes as well as overall advantages and limitations of cavitation based AOPs. Acknowledgements The authors gratefully acknowledge financial support from the National Science Centre for project UMO-2017/25/B/ST8/01364. Literature 1. G. Boczkaj, A. Fernandes, 2017, Wastewater treatment by means of Advanced Oxidation Processes at basic pH conditions: A review, Chem. Eng. J. 320, 608-633. 2. M. Gągol , A. Przyjazny , G. Boczkaj, 2018, Wastewater treatment by means of advanced oxidation processes based on cavitation – A review, Chem. Eng. J. 338, 599-627. 3. K. Fedorov, M. Plata-Gryl, J. Khan, G. Boczkaj 2020, Ultrasound-assisted heterogeneous activation of persulfate and peroxymonosulfate by asphaltenes for the degradation of BTEX in water, J. Hazard. Mater. 397 (2020) 122804 4. K. Fedorov, X. Sun, G. Boczkaj, Combination of hydrodynamic cavitation and SR-AOPs for simultaneous degradation of BTEX in water, Chem. Eng. J. 2021 in press, 5. E. Cako, K. Dinesh, R. Soltani, G. Boczkaj Ultrafast degradation of brilliant cresyl blue under hydrodynamic cavitation based advanced oxidation processes (AOPs), Water Res. Ind. 24 (2020) 100134, 6. M. Gągol, R. D. C. Soltani, A. Przyjazny, G. Boczkaj 2019, Effective degradation of sulfide ions and organic sulfides in cavitation-based Advanced Oxidation Processes (AOPs), Ultrason. Sonochem. 58, 104610. 7. M. Gągol, E. Cako, K. Fedorov, R. Soltani, A. Przyjazny, G. Boczkaj, Hydrodynamic cavitation based advanced oxidation processes: Studies on specific effects of inorganic acids on the degradation effectiveness of organic pollutants, J. Mol. Liq. 307 (2020) 113002.